Method of producing platina copy-paper.



Noi'zsaose; I Y Patented Aprnee, 1904." UNITED 'STATES PATENT OFFICE.

ANDREAS LURZ, or vIENNA, AUSTRIA-HUNGRY, AssIeNoIt or ONE-HALF To Huso RITTER GABLERvoN ADLERsFELD, or VIENNA, AUSTRIA- HIINGARY.

METHOD oF PROD'UGING PLATIN COPY-PAPER.

SPECIFICATION forming part of`Letters Patent No. 758,086, dated April V26,` 1904.

i Application filed November 19, 1901. Serial No. 82,8%. (No specimens.) v

T0 @ZZ 10h/0m it may COU/067%: -is spread after the drying of the preceding Be it known that I, ANDREAS LURZ, photoglayer. YAlso it must be observed that the rapher, a `citizen of Austria, residing at VIII `spreading of every salt solution must be made Josefstdterstras se No 33,at Viennafrovince in oneoperation in order to'avoid an'unequally- 5 of Lower Austria, Austria-Hungary, have inprepared paper. t f

vented certain new and useful Improvements p The purpose of the present invention is to `in Methods of Producing Platina Copy-Paavoidthedisadvantagesbeforementioned; and

per; and I hereby declare the following to be the -method consists, essentially, in covering a full, clear, and exact description of the inthe surface of the paper to be prepared `witht I0 vention, such as will enable others skilled in the suitable salt solutions in acertain' succesthe art to which it appertains to make and use j siolf, while every following layer is only spread the same. after p a complete drying of the preceding 60 The usual photographical platinamethod eslayer. The severallayers are not spreadl at sentially consists inthe use of a sensitive subonce, butin three operations. The paper is- I5 stanceof suitable platina salts, which is spread first4 prepared, then the substance spread and on the paper to be prepared. The first trials carefully distributed over the whole surface to obtain platina-photographs have been based of the paper, while the spreading is made im- Aon the use of a salt requiring the developmediately after the first moistening. The subment of the image by means of a hot solution; stances are applied to the paper by means of 2O but such images have a characteristic sepia three rollers or cylinders, each dipping in a color. `Until now the papers have been pretrough containing the solution. The end cylpared by spreading the suitable salt solutions inders are smooth-rubber cylinders, and the 7o on one side of the paper. The. results of middle one is afelt cylinder. One of the rubthis method depend on the lskill of the opber cylinders serves for the preliminary prep- 25 erator. On the one hand, these methods of aration (the moistening) of the paper, the spreading require a greater quantity of liqfelt cylinder serves to spread the substance, uid. On the other hand, bubbles are formed and the third rubber cylinder distributes in accordance with the natureof the solutions. equally the substance. The substance is spread The removal of vthese bubbles consumes condirectly on the moistened paper, and the dis- 30 siderable time, and the surface of the paper tribution is effected immediately after spreadis softened, and the substance penetrates too ing by means of a cylinder which dips in the deep in the paper in consequence of its spesubstance. Every such layer is formed by cific weight, while the points of the fibers rest three operations. There are as many spreaddry and the paper and also the copies ob ing devices as solutions of different composi- 35 tained with the same receive a weak color. tion, and between each two of these spread- It is also to be noted that the substances are ing devices a drying apparatus is inserted for highly hygroscopic and that they are thinly the purpose of drying the first spread subliquid, causing crystallizations of the substance before the next follows.

stances during theY operation under the weak- Preferably, the operation is made in such 40 est draft of air or when the temperature is a manner that the paper is led over the cylinnot favorable, while also thev crystals absorb ders, dipping in the trough without counterthe moisture of the air and are dissolved. In pressure, so that only the under surface of both cases the paper is worthless. The practhe paper will be prepared. This has the adtice has shown that itis not possible to mix vantage that the specifically heavier-particles 45 the sensitive layer of the solutions before of the solutions rest more on the fiber-points spreadingit; but itis necessary to bring the and penetrate less in the paper, so that a cornvarious salt solutions separately on the paper pletely smooth surface can be obtained. in such a manner that the following solution In the accompanying drawing there is shown diagrammatically a form of an apparatus for` carrying out the operation.

by the felt-cylinder c, so that the spreadingV operation is eected in three phases.

By means of the device A lead and ironsalt solution, for instance, is spread, by means of the second device iron-salt solution is spread, and by means .of the third device a platina solution, the salt solutions being of secondary importance.

From the drying device, arranged behind` the last spreading device, the paper is led to a .glazing apparatus and finally rolled or cut into sheets and is then ready for use.

I would state that all 'the troughs in each set'of chemical-applying ydevicesA--that is to say, troughs a a a of the device through which the paper passes after leaving the paperroll-*contain the saine chemical solution, as lead-and-salt solution. The .troughs d a' a of the second set kof chemical-applying devices contain the same chemical solution-z' e., iron- `salt'solution-While the troughs of theythird set lof chemical-applyingv devices contain the same chemical solution-11. e., platina solution. Thus it Will be see-n the troughs a a a each contain one solution, the troughs a a a each contain another solution, and so on. A common trough could be substituted for the troughs a, into which the rolls b c d could dip, and this could be done for the other troughs.

A trough is 'preferably usedA for each roll simplyto avoid the use of too great a quantity of the solutions which would be necessitated Where common troughs are used.

The herein-described method of preparing platina paper for photographic purposes wherein the sensitive surface is composed of successively-applied layers of chemical substances Which consists in rst moistening the paper on one side only, then applying a chemical substance to the moistened side of the paper, spreading the said substance smoothly over the said side of the paper, then drying the Whole, and then applying the successive layers of vchemical substances in substantially the same manner, thel drying operation being performed .after .one layer has been applied and before the application of -a 4succeeding layer.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing Witnesses.

' ANDREAS LURZ.

Witnesses: 1

WILHELM BERGER, ALvEs'ro S. HoGUE. 

